1 /*	$OpenBSD: log.c,v 1.1 2018/07/10 16:39:54 florian Exp $	*/
2 
3 /*
4  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #define _GNU_SOURCE
20 
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <stdarg.h>
24 #include <string.h>
25 #include <syslog.h>
26 #include <errno.h>
27 #include <time.h>
28 
29 #include "log.h"
30 
31 static int		 debug;
32 static int		 verbose;
33 static const char	*log_procname;
34 
35 void
36 log_init(int n_debug, int facility)
37 {
38 	extern char	*__progname;
39 
40 	debug = n_debug;
41 	verbose = n_debug;
42 	log_procinit(__progname);
43 
44 	if (!debug)
45 		openlog(__progname, LOG_PID | LOG_NDELAY, facility);
46 
47 	tzset();
48 }
49 
50 void
51 log_procinit(const char *procname)
52 {
53 	if (procname != NULL)
54 		log_procname = procname;
55 }
56 
57 void
58 log_setverbose(int v)
59 {
60 	verbose = v;
61 }
62 
63 int
64 log_getverbose(void)
65 {
66 	return (verbose);
67 }
68 
69 void
70 logit(int pri, const char *fmt, ...)
71 {
72 	va_list	ap;
73 
74 	va_start(ap, fmt);
75 	vlog(pri, fmt, ap);
76 	va_end(ap);
77 }
78 
79 void
80 vlog(int pri, const char *fmt, va_list ap)
81 {
82 	char	*nfmt;
83 	int	 saved_errno = errno;
84 
85 	if (debug) {
86 		/* best effort in out of mem situations */
87 		if (asprintf(&nfmt, "%s\n", fmt) == -1) {
88 			vfprintf(stderr, fmt, ap);
89 			fprintf(stderr, "\n");
90 		} else {
91 			vfprintf(stderr, nfmt, ap);
92 			free(nfmt);
93 		}
94 		fflush(stderr);
95 	} else
96 		vsyslog(pri, fmt, ap);
97 
98 	errno = saved_errno;
99 }
100 
101 void
102 log_warn(const char *emsg, ...)
103 {
104 	char		*nfmt;
105 	va_list		 ap;
106 	int		 saved_errno = errno;
107 
108 	/* best effort to even work in out of memory situations */
109 	if (emsg == NULL)
110 		logit(LOG_ERR, "%s", strerror(saved_errno));
111 	else {
112 		va_start(ap, emsg);
113 
114 		if (asprintf(&nfmt, "%s: %s", emsg,
115 		    strerror(saved_errno)) == -1) {
116 			/* we tried it... */
117 			vlog(LOG_ERR, emsg, ap);
118 			logit(LOG_ERR, "%s", strerror(saved_errno));
119 		} else {
120 			vlog(LOG_ERR, nfmt, ap);
121 			free(nfmt);
122 		}
123 		va_end(ap);
124 	}
125 
126 	errno = saved_errno;
127 }
128 
129 void
130 log_warnx(const char *emsg, ...)
131 {
132 	va_list	 ap;
133 
134 	va_start(ap, emsg);
135 	vlog(LOG_ERR, emsg, ap);
136 	va_end(ap);
137 }
138 
139 void
140 log_info(const char *emsg, ...)
141 {
142 	va_list	 ap;
143 
144 	va_start(ap, emsg);
145 	vlog(LOG_INFO, emsg, ap);
146 	va_end(ap);
147 }
148 
149 void
150 log_debug(const char *emsg, ...)
151 {
152 	va_list	 ap;
153 
154 	if (verbose) {
155 		va_start(ap, emsg);
156 		vlog(LOG_DEBUG, emsg, ap);
157 		va_end(ap);
158 	}
159 }
160 
161 static void
162 vfatalc(int code, const char *emsg, va_list ap)
163 {
164 	static char	s[BUFSIZ];
165 	const char	*sep;
166 
167 	if (emsg != NULL) {
168 		(void)vsnprintf(s, sizeof(s), emsg, ap);
169 		sep = ": ";
170 	} else {
171 		s[0] = '\0';
172 		sep = "";
173 	}
174 	if (code)
175 		logit(LOG_CRIT, "fatal in %s: %s%s%s",
176 		    log_procname, s, sep, strerror(code));
177 	else
178 		logit(LOG_CRIT, "fatal in %s%s%s", log_procname, sep, s);
179 }
180 
181 void
182 fatal(const char *emsg, ...)
183 {
184 	va_list	ap;
185 
186 	va_start(ap, emsg);
187 	vfatalc(errno, emsg, ap);
188 	va_end(ap);
189 	exit(1);
190 }
191 
192 void
193 fatalx(const char *emsg, ...)
194 {
195 	va_list	ap;
196 
197 	va_start(ap, emsg);
198 	vfatalc(0, emsg, ap);
199 	va_end(ap);
200 	exit(1);
201 }